```python
# Here is a simple recipe for pickled mustard greens:
Ingredients:
- 500g mustard greens
- 2 tbsp salt
- 1 tbsp sugar
- 1/2 cup rice vinegar
- 1/2 cup water
- 2 cloves garlic, minced
- 1 red chili pepper, sliced (optional)
Instructions:
1. Wash the mustard greens thoroughly and cut them into thin strips.
2. In a large bowl, mix the mustard greens with salt and let it sit for about 30 minutes to draw out excess moisture.
3. Rinse the mustard greens under cold water and squeeze out any excess liquid.
4. In a separate bowl, combine sugar, rice vinegar, water, garlic, and chili pepper.
5. Add the mustard greens to the vinegar mixture and mix well.
6. Transfer the mixture to a clean glass jar and press down the greens to remove any air bubbles.
7. Seal the jar tightly and let it sit at room temperature for 1-2 days to ferment.
8. Store the pickled mustard greens in the refrigerator and enjoy as a condiment or side dish.
Enjoy your homemade pickled mustard greens!
```
